[PySide] Correction: TypeError setting multiple inheritance instance as QWidget parent

[Owen Kelly]

My first email had inaccurate code.

The revised code shows Foo subclass initializations.

The TypeError is still present with this code.

 

import sip

sip.setapi('QString', 2)

sip.setapi('QUrl', 2)

 

from PySide import QtGui

 

class Node(object): 

    def __init__(self, str):

        pass

 

class Foo(QtGui.QTabWidget, Node): 

    def __init__(self):

       super(Foo, self).__init__(parent=None)  # should call
QtGui.QTabWidget.__init__(self, parent=None)  

       Node.__init__(self,'Node name is Disp')

       self.bar = Bar(self)  # Can I fix a TypeError here by giving a
different argument to Bar?

 

class Bar(QtGui.QDialog):

    def __init__(self, parent_widget):

        super(Bar, self).__init__(parent=parent_widget) # <<<<<<<<==========
TypeError occurs here

        #QtGui.QDialog.__init__(self, parent=parent_widget)  # using this
line instead of line above gives same error

 

 

 

From: Owen Kelly [mailto:oekelly at ieee.org] 
Sent: October-10-12 1:08 PM
To: 'pyside at qt-project.org'
Subject: TypeError setting multiple inheritance instance as QWidget parent

 

Hello all,

 

I am migrating from PyQt to PySide; the PyQt code works.

I am trying to resolve a multiple inheritance issue.

 

The problem seems to be that PySide.QDialog.__init__ does not recognize an
instance of Foo as a possible parent.

 

unhandled TypeError

QDialog(QWidget parent=None,Qt.WindowFlags flags=0): argument 'parent' has
unexpected type 'Foo'

 

However, Foo is subclassed from QWidget but also from another class, Node.

Simplified code:

 

import sip

sip.setapi('QString', 2)

sip.setapi('QUrl', 2)

 

from PySide import QtGui

 

class Node(object):

  pass

 

class Foo(QtGui.QTabWidget, Node): 

  def __init__(self):

    self.bar = Bar(self) # Can I fix this by giving a different argument to
Bar?

 

class Bar(QtGui.QDialog):

    def __init__(self, parent_widget):

        super(Bar, self).__init__(parent=parent_widget) # <<<<<<<<==========
TypeError occurs here

        #QtGui.QDialog.__init__(self, parent=parent_widget)  # using this
line instead of line above gives same error

 

Is the solution here that I should use composition instead of inheritance?

A related question may be this
http://stackoverflow.com/questions/8335930/python-how-to-get-the-base-instan
ce-of-an-instance

 

Python 2.6.6, Win32, PySide 1.1.1

 

If multiple inheritance is not possible, maybe 

qt-project.org/wiki/Differences_Between_PySide_and_PyQt 

could be updated.

 

Thanks for your suggestions.

 

Owen

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